Instrument



FIG. 1 shows a front, right-hand side perspective view of the instrument;

FIG. 2 shows a front elevation view thereof;

FIG. 3 shows a right-side elevation view thereof; and,

FIG. 4 shows a left-side elevation view thereof.

The broken lines illustrate portions of the instrument that form no part of the claimed design. 

CLAIM The ornamental design for an instrument, as shown and described. 